BUTTERFLIES OF MONTANA. 119 



42. Phycanassa (Pamphila) vitellus, Fab. (delaware, Edw.) 



43. Ambliscirtes vialis, Edw. 



44. Pyrgus montivaga, Reak. (tesselata, Scud.) 



45. Scelothrix (Pprgus) scriptura, Bois. 



46. Thanaos perseus, Scudder. 



This list of 46 species is given by W. H. Edwards in the Canadian 

 Entomologist, Vol. XIV, p. 6, 1882. As here given the nomenclature used 

 in this work has been used. Where the names used by Edwards are dif- 

 ferent from those used in this book they follow immediately and without 

 commas, in parentheses. Where parentheses do not occur the Edwards 

 names and names used by us are the same. 



From this list it is impossible to tell which specimens were collected 

 in Montana and which in Dakota. The species which are not included 

 in this work are Nos. 20, 25, 26, 41, 42, and 43. Whether these are to be 

 included in the lost from Montana is yet to be determined. 



Genus OENEAS HUEBNER. 



The Arctics. 



Butterfly The antennae are short, the eyes of moderate size; The 

 front full, protuberant; the palpi slender; the fore wing somewhat pro- 

 duced at the tip; with the outer margins rounded and the hind margins 

 slightly, if at all, sinuated. The nervules of the fore wings are slightly 

 dilated toward the base; the hind wings are elongated, oval, and the outer 

 margins evenly rounded. The color of these butterflies is some shade 

 of brown; the outer margin is generally lighter than the base of .the 

 wing, and is marked with black spots, sometimes pupiled with white. The 

 wings are generally marbled and mottled on the under side, and some- 

 times crossed on the middle of the hind wings by a broad band of darker 

 color. The fringes are brown, checkered with white. The eggs are 

 ovate, spherical, marked with sculptured ridges. The caterpillars are 

 pale green or brown, marked by darker stripes upon the back and on the 

 sides. The chrysalids are stout, very slightly angulated, and are formed, 

 so far as we know, unattached under stones and at the roots of grasses. 



The genus contains insects belonging to the Arctic fauna, which are 

 formed in the far north or dwell upon the lofty mountain summits where 

 the season is short. Of the large number of species formerly recognized 

 but seven are retained, the others being placed as snb-species or varieties. 

 At the present time but two are recorded from the state, although we 

 should expect nevadensis, and possibly macounii. 



Key to species. 



Dark brown color, covering basal and median areas; a broad band of 

 lighter shade on outer margin; under side mottled with white and 

 brown. chryxus 



Smaller, lighter in color; under side mottled with brown and black 



varuna 



